(Passive): Armor and Magic Resistance Garen gains from Items, Runes, and Masteries are increased by 20%.
(Active): Garen places a defensive shield on himself, decreasing all damage taken by a percentage and reducing the effectiveness of Crowd Control by 30%.
No Cost
Damage Reduced: 30%
Duration: 2/3/4/5/6 seconds
Cooldown: 24/23/22/21/20 seconds

Endgame items

Thornmail

+100 Armor
UNIQUE Passive: Upon being hit by a basic attack, reflects magic damage back to the attacker equal to 25% of your bonus Armor plus 15% of the incoming damage.
(Bonus Armor is Armor from Items, Buffs, Runes and Masteries.)
(Reflect damage is calculated based on damage taken before being reduced by Armor.)

Tank with DMG

Start with Doran's Blade is good, but when you feel problems you can take starting item Doran's Shield. When you win top, you can build at first item The Brutalizer. In endgame items you didn't must build Thornmail, but when enemy have feed ADC its fine. Sorry for OP English.